Need any advice/help as how to grind, polish, drill, etc.lab sapphire/ruby into a SHARP knife blade?Also would appreciate advice as where to buy scrap lab sapphire/ruby laser rods, slabs, boules, etc. in lengths of at least 4" cheap. Can be rejects, scrap or ??? as I'm planning on trying to make custom knife blades. Any advice appreciated?MikePS Please email me replies or call...503 325 0861